Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session III
CPP 37.31: Poster
Wednesday, April 3, 2019, 11:00–13:00, Poster B1
IR spectroscopic investigation of precursor aromatization of poly(p-phenylene) — •Rainer Bäuerle1,2, Ali Abdulkarim3, Karl-Philipp Strunk1,4, Jan Freudenberg2,3, Daniel Jänsch2,3, Sebastian Beck1,2, and Annemarie Pucci1,2 — 1Kirchhoff-Institut für Physik, Universität Heidelberg — 2InnovationLab, Heidelberg — 3Organisch-chemisches Institut, Universität Heidelberg — 4Centre for Advanced Materials, Universität Heidelberg
Two challenges of the long-desired prototype of a conjugated polymer semiconductor poly(para-phenylene) (PPP) are its difficult synthesis and its insolubility. Both problems have been recently overcome by a new precursor route. [1] We investigate and compare the thermal aromatization of a kinked and a linear precursor polymer using IR spectroscopy and UV-vis ellipsometry on thin films.
For a kinked precursor polymer we find that the aromatization speed increases with increasing temperature and decreases with decreasing layer thickness yielding unordered PPP induced by the unordered precursor.
In contrast to this, the aromatization kinematics of a linear precursor is independent from layer thickness and already the thin film of the precursor exhibits near-range order which is passed through to the converted PPP. The low conversion temperature (<250 ∘C) makes our PPP feasible for fabrication of plastic devices. It was further proven that PPP is long-time stable and shows no degradation.
[1] A. Abdulkarim et al., J. Am. Chem. Soc., 2016, 138 (50), pp 16208-16211